From 992665eab6c48d6a4819f42509346d24b277485d Mon Sep 17 00:00:00 2001
From: David Malcolm <dmalcolm@redhat.com>
Date: Thu, 2 Sep 2021 16:17:29 -0400
Subject: [PATCH 15/17] Conditionalize test for PR libstdc++/87135 on
 __LIBSTDCXX_SO_VERSION >= 9

This VERIFY was added upstream 2018-09-18 as part of:
  re PR libstdc++/87135 ([C++17] unordered containers violate iterator validity requirements)
    https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=a521e62615e439aea7502a52fd0f8a21eaa6304f

but fails when run in DTS against a system libstdc++.so from an older GCC.

In particular, rehash from the header is using
  std::__detail::_Prime_rehash_policy::_M_next_bkt
from the system .so:

   12: 0000000000000000      0 FUNC    GLOBAL DEFAULT    UNDEF std::__detail::_Prime_rehash_policy::_M_next_bkt(unsigned long) const@GLIBCXX_3.4.18 (5)
  225: 0000000000000000      0 FUNC    GLOBAL DEFAULT    UNDEF std::__detail::_Prime_rehash_policy::_M_next_bkt(unsigned long) const@@GLIBCXX_3.4.18
---
 .../23_containers/unordered_map/modifiers/reserve.cc          | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libstdc++-v3/testsuite/23_containers/unordered_map/modifiers/reserve.cc b/libstdc++-v3/testsuite/23_containers/unordered_map/modifiers/reserve.cc
index 58c8924b9..4c79ec2e6 100644
--- a/libstdc++-v3/testsuite/23_containers/unordered_map/modifiers/reserve.cc
+++ b/libstdc++-v3/testsuite/23_containers/unordered_map/modifiers/reserve.cc
@@ -46,7 +46,11 @@ void test01()
 
 	  // As long as we insert less than the reserved number of elements we
 	  // shouldn't experiment any rehash.
+
+	  // Fixed upstream in GCC 9
+#if __LIBSTDCXX_SO_VERSION >= 9
 	  VERIFY( m.bucket_count() == bkts );
+#endif
 
 	  VERIFY( m.load_factor() <= m.max_load_factor() );
 	}
-- 
2.31.1